Sweet gag? (10)
I believe the answer is:
gobstopper
This clue might be a double definition.
'sweet' is the first definition.
(type of large sweet)
'gag?' is the second definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for gobstopper that I've seen before include "Big sweet" , "Hard round sweet" , "Large, hard sweet to suck" , "Large, hard spherical sweet" .)